T904] MAC DOUGAL—DELTA AND DESERT VEGETATION 55 
The Jarge number of species with laticiferous juices was especially 
noticeable, but with the exception of the dozen Cacti no plants with 
organs for the storage of water were seen, a fact possibly connected 
with the extremely low precipitation and low water content of the 
soil at all times. Seeds of a Cenchrus were very abundant and were 
Fic. 6.—Desert of Baja California, looking westward from beach north of San 
Felipe Bay; Opuntia, Covillea, and Fouquiera. 
used by burrowing rodents as a means of fortification of the entrances 
to their burrows, in the same manner that the joints of the “‘cholla”’ 
are employed elsewhere. 
A mountain to the southwestward of San Felipe Bay was climbed 
and a summit reached at an elevation of over 1000". The granite 
slopes supported a sparse vegetation of such types as Mammillania, 
Ephedra, Bursera microphylla, Asclepias albicans, Eriogonum infla- 
